HubΒΆ
The field hub
describes the hub system currently leveraging much of the WISDEM way to design wind turbine hubs. This will change soon. In addition, the equivalent mass and inertia properties of the hub system can be listed in the field elastic_properties_mb
.
diameter: 7.94
cone_angle: 0.06981317007977318 # 4 deg
drag_coefficient: 0.5
flange_t2shell_t: 6.0
flange_OD2hub_D: 0.6
flange_ID2OD: 0.8
hub_blade_spacing_margin: 1.2
hub_stress_concentration: 3.0
n_front_brackets: 5
n_rear_brackets: 5
clearance_hub_spinner: 0.5
spin_hole_incr: 1.2
pitch_system_scaling_factor: 0.75
spinner_gust_ws: 70.0
hub_material: cast_iron
spinner_material: glass_uni
diameter
Float, mThis is the outer diameter of the hub. It is also the diameter of the circle centered at the rotor apex and connecting the blade root centers.
cone_angle
Float, radThis is the precone of the rotor. It is defined positive for standard upwind and downwind rotors.
drag_coefficient
FloatThis is the equivalent drag coefficient used to compute the aerodynamic forces generated by the hub immersed in the flow. Standard aeroelastic solvers use this parameter.
elastic_properties_mb.system_mass
Float, kgThis is the overall mass of the hub system, which includes the hub itself, but also the spinner, the pitch system, the blade root bearings, and auxiliary equipment.
elastic_properties_mb.system_inertia
Array (6) of floats, kg*m2Mass moments of inertia of the hub system. Ixx, Iyy, Izz, Ixy, Ixz, Iyz are expressed around the hub center in hub-aligned coordinate system, which has x aligned with the main shaft pointing from the rotor apex towards the nacelle. Iyy and Izz are usually identical.
elastic_properties_mb.system_center_mass
Array (3) of floats, mCoordinates of the center of mass of the hub with respect to the hub-aligned coordinate system.